Vernier dial



Filed Jan; 26', 1925 ATTORNEY I 1y adapted for radio use so that an extremely Patented July 19, 1927.

. UNITED STATES A 1,636,233 PATENT OFFICE.

HENRY .nxAson, or DAYTON, 0310, assrenon To THE KURz-KAson COMPANY, 01 SOUTH BROADWAY, NEAR DAYTON, onto, A CORPORATION or OHIO.

VEBNIER DIAL.

This invention relates to new and useful improvements in Vernier dials.

It is the principal object of my invention to provide a Vernier dial which is particularminute and accurate adjustment of a condenser or other part may be obtained. WVith my Vernier dial it is easy to obtain, with accuracy, stations whose dial logs or readings terminate in fractions such as tenths.

My Vernier dial is simple in construction, it is economical to make and has an easy and silent operation.

In the accompanying drawings, Figure 1 is afront view of my improved vernicr dial. Figure 2 is a sectional view, thereof taken on the line 22 of Figure 1. Figru'e 3 is a sectional View taken through the same on the line 33 of Figure 1. And Figure 4 is a plan view of the dial. showing the Vernier attachment in its relation thereto.

Referring to the accompanying drawings. the numeral 1 designates a dial. such as is used in radio apparatus, and formedwith a beveled. edge containing preferably upon one half of its circumference equally spaced graduations from 0 to 100. although any greater or less number may beprovided on it if desired. This dial. which is prefen ably constructed of bakelite, has an out.- wardly projecting hub portion 2 to receive theouter end of a shaft such'as the condenser shaft 3 which projects through a hole in a panel 4. To the latter there is secured, by screws 5, 5, a Vernier plate 6 in a sui able position to bring its graduations, which are represented by 11 equally spaced lines extending radially to the inner curved edge of it, for co-incidence with the divisions on the dial scale when the latter is turned the proper distance by the means now to be described.

The dial is formed substantially between its center and its outer graduated portion. with a semi-circular slot 7 which permits the dial to be moved the length of the slot over the head of a screw 8 and the downwardly and forwardly turned end 9 of an arm 10 which said screw fixedly secures to the panel 4. The arm 10 is preferably formed in the shape of a paddle, with its widened portion slightly inclined to that of its handle part and provided with a central hole through Which the hub 2 of the dial freely projects.

Pivotally secured by a pin 11 to one outer 26, 1925. Serial No. 4,789..

corner of the enlarged part of thearm 10, below the latter, is a gear 12 which is preferably constructed of bakelite'. This gear meshes with teeth 13 preferably formed of bakelite around an inner, annular shoulder 1 L provided on the dial 1.

Pivotally secured within the other outer corner part of the enlarged portion of the arm 10, is the stem of a pinion 15 which lies below the arm for mesh with the gear 12. The stem of the pinion 15 terminates above the arm in a reduced portion 16 to which there fixedly secured a gear .17 preferably constructed of bakelite This gear meshes with the teeth-18 formed on the exterior part ofthe inner end. of the inner tubular extension or sleeve 19 of a knob20. This knob, I

which is preferably made of bakelite, is frustro-conical. being at its inner en d formed with a rim which tapers outwardly from its normally vinclined part, and then downwardly in line with its. axis to bridge the annular toothed portion 13 of the dial.

The knob 20 is free to turn loosely around the dial hub'2 which is'formed to receive a split sleeve 21- that is tapered at its inner end and externally threaded at its outer end to receive a lock nut 22. Adapted to be screwed upon the threaded'end of the tapered sleeve 21 beyond the lock nut 22, is

the interiorly threaded hub 23 of a small outer knob 24:. The hub portion 23 of the latter near its inner end is formed with a shoulder 25 that seats against the top of the large knob 20 which is free to be turned independently of the latter.

' lVhen my Vernier dial unit is assembled,

the split tapered sleeve 21 within the hub 2 of the dial, is slipped on the shaft 3 against the panel 4:. The lock nut 22 is then screwed on the sleeve a suiiicient distance to cause the tapered wall of the dial hub to press the' tapered part of the sleeve tightly against the shaft 3 to establish a non-slipping connection with it. The small. knob 24 is then screwed on the sleeve above the lock nut.

In operation, when it is desired to turn the dial 1 to bring one of its division lines into co-incidence with a graduation line on the vernier plate 6, the knob 20 is rotated by the fingers. When the knob 20 is turned, its inner toothed periphery 18, which is in mesh with the gear 17, will rotate the latter. This gear 17 being secured to the pinion stem 16, will turn the pinion 15 which is in mesh with the gear: 12: Since the latter gear is in engageemnt with the teeth 13 formed on the dial 1, it will turn the latter, whenthe knob 20 is rotated, in a ratio of 10 to 1.

If a broadcasting station whose dial log is 64.8 is desired, the knob 20 is turned counterclockwise until the division line 64; on the dial coincides with theft) graduationon the vernier plate (3. The rotation of the knob 20 is then continued until the first division line on the dial next behind the graduation line 8on the Vernier plate 6, is brought into alinelnent witli saidgraduation line. (See' Figure-*4.) It isthus possible,

' readily and accurately, to turn the dial 1,

and through it thecondenser shaft 3, the distance necessary to obtain a station whose diallog or reading isrepresented by a=whole number and a fraotiom Having described iny'invention, I claim:

1. In a device of the type described, a panel containing a hole, a shaft projecting through said hole, dial secured to said shaft and formed with a curved slot, a knob free to'turn around said shaft, an arm between the knob and dial, means projecting loosely through the curved slotin the d'al for securin one end of the arm to said'panel, said dial having an offset toothed annular portion and theknoban outer toothed periphery, and a gear-trainsecured to the-free end of saidarin for' operativeconnection between thetoothed portions-of the knob and dial, tot-urn the" latter and through it the shaft when the knob isrOtated.

2. In a device of the type described, a panel containing a hole', a shaft projecting through said hole, a dial secured to said shaft and formed with a cur ved slot, said dial also having an outwardly extending hub portion, a knob having an interior tubular extension forlnedwith an annular row of external'teeth, rotatable around the hub portion of the dial, said dial formed with a curved slot, an arm between the knob and dial, means projecting loosely throughthe curved slot invthedial for securing one end offsaidanntot-he panel, said dial having an outer, offset toothed annular portion, a pinion, a stem for the latter pivotally secured in the free end of said arm, a gear onsaid stennin meslrwith the toothed tubular extension of said knob, and a gear pivotally secured to said arm, in mesh with the pinion and the annular toothed portion of thedial to turn the latter, and through it the shaft, whenthe knob is rotated.

3. In a device of the type described; a panelcontaining a h0le,.a.shaft projecting throughsaid hole, a dial havingahub por tion, a sleeve between the shaftand the hub portion of said dial and projecting beyond saidhub portioina knob having atubnlar extension secured to the outer end of said sleeve, a second knob between the-dial'and the tint knob and havingan inner tubular extension rotatagle around the tubular extension of th'e'first knob and the hnb pol tion of the dial, and means operatively con nected between the second knob and the dial to turn the'latter, and through it the shaft; when the second knob is rotated.

4. In a device of the tyne described, a panel containing a hole, a shaft projecting through said hole, a dial having a hub portion securedto said shaft, a knohnaving a tubular extension secured to the-shaft beyond the hub portion of. the dial, a second knob rotatable around the tubular extension of the first knob and the hub portion of the dial, and means operatively connected between the second knob and the dial to turn the latter, and through it the shaft, when the second knob is rotated.

In testimony whereof I have hereunto set Inyhandthis 24th day of January, 1925a HENRY J. KASCH; 

